Half to mabel a



(No Model.)

A. L. NEWTON. MORTI-SING AUGBR.

No. 479,37'7.- Patented July 19, 1892.

UNITED ST TES PATENT CFFICE.

ANDREWV LARS NEWTON, OF N ORIVICH, CONNECTICUT, ASSIGNOR OF ONE- HALF TO MABEL A. EVANS, OF SAME PLACE.

MORTlSlNG-AUGER.

SPECIFICATION forming part of Letters Patent No. 479,37 7, dated July 19, 1892. Application filed June 20, 1891. Serial N-3961981- (N0 model.)

To all whom it may concern:

Be it known that I, ANDREW LARS NEWTON, a citizen of the United States, residing at Norwich, in the county of New London and State of Connecticut, have invented certain new and useful Improvements. in Mortising-Augers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled IO in the art to which it appertains to make and use the same.

My invention consists in a new and improved mortisingauger for boring square holes, and which can also be arranged for boring oblong or other shaped holes, and the invention will be hereinafter fully described and claimed.

Referring to the accompanying drawings, Figure 1 is a perspective view of my new and improved mortising-auger. Fig. 2 illustrates in detail, on an enlarged scale, the lower end thereof. Fig. 3 is a diametrical section of the upper end of the auger. Fig. 4 is an inverted plan view of the cap-piece formed with the oblong groove to adapt the auger to cut an oblong instead of a square hole. Fig. 5 is a similar View of the cap provided with a square groove. Fig. 6 is a detail perspective view of the cross-head and a portion of the rocking o lever, and Fig. 7 is an inverted plan View of the lower end of the auger.

Referring to the several parts by their designating-numerals, 1 indicates the main bit of the auger, the upper end of which is adapt- 3 5 ed to fit in the ordinary crank-brace. The body of this bit is flattened on one side at 2, and at its lower end is formed with the usual screw-point 3 and cutting-edge 4. In the flattened side of the lower end of the bit, just 0 above the cutter 4:, is formed aflanged recess 5, which is slightly inclined, as better shown in Fig. 6, and in which is seated the laterallyreciprocating cutting-blade 6. The body of this blade is slightly inclined, as shown, and

is formed with the upper and lower edge flanges 7 8 to adapt it to fit and slide in the flanged recess 5, the lowerouter end of the blade being provided with the cutting point and edge 9 10.

To the fiat side of the bit 1 is pivotally connected by a pivot-pin 11 a rocking lever 12, which is flattened on its inner side to adapt it to fit against the flat side of the bit. The lower end of this lever 12 is provided with a longitudinal slot 12 to receive a lug 12 carried by the auxiliary cutting-blade 6, while its upper end is fixedly connected to the slightly-curved and slotted cross-head 13. The upper part of the bit passes through the longi tudinal slot of the cross-head and is provided with square shoulders 14, which serve as a guide for the laterally-movable cross-head and prevents the same from turning upon the upper end of the bit.

15 indicates the cap-piece, which is preferably circular in form and slightly concave, this cap-piece having a round central opening, which adapts it to fit and turn loosely upon the upper end of the bit, while a fixed collar 16 holds the cap-piece in its proper position. On'the upper side of the cross-head, at one end thereof, is formed an upwardlyprojecting lug 17, which fits into a square groove 18, formed in the under side of the cap-piece, which groove has its corners rounded, so as to allow a free passage of the said lug l7.

Fixedly connected to the cap-piece 15 and extending laterally therefrom is a handle 19, through the medium of which said cap-piece may be held stationary while the bit and the parts carried thereby are rotating.

My new and improved mortising-auger is operated as follows: The upper end of the bit 1 is fastened in the usual crank-brace and the point of the auger being applied to the timher in which the mortise is to be cut the workman takes hold of the handle 19 with his left hand while he revolves the crank-brace with his right hand, it being customary to press against the upper end of the crank-brace with the body in order to hold the same in the proper position. The handle 19 and cap-piece 15 are held stationary while the bit 1 is being revolved by the brace, and it will be seen that as the lower end of the brace bores the hole in the wood the projecting lug 17 will travel in the square groove 18 in the under side of the stationary cap-piece. When the lug 17 reaches a corner of the square groove, rco

the lever 12 will lie straight along the middle of the bit, the cutting-blade 9 of the blade 6 then resting in a recess 20 in the lower end of the bit, while, as the bit passes the corner of the groove and travels along one of its straight sides, it will move the cross-head 13 to one side, thus rocking the lever 12 on its central pivot and sliding the blade 6 out of the bit-groove 5, so that its cutting-point 9 Will be projected out to one side of the lower end of the bit. It will be seen that this movement will be automatically repeated at each of the four corners of the square hole which is being bored or cut in the timber by the auger, thus cutting out the corners of the hole and cut ting a perfectly-square mortise in the timber, as will be readily understood. It will be further seen that by using the cap-piece shown in Fig. 4, having the oblong groove instead of a square groove, the blade 6 will be manipulated so as to cut an oblong hole or inortise in the timber, and, in fact, any shaped hole can be bored in the timber by forminga correspondingly-shaped groove in the cap piece 15. The lever 12 is preferably formed with three or more apertures 12, and the central part of the bit will be formed with a corresponding series of apertures 12 so that by shifting the removable pivot-pin 11 nearer to or farther from the lower end of the bit the stroke of the lever 12, and consequently the size or Width of the hole which is being bored, can be regulated or adjusted.

From the foregoing description, taken in connection with the accompanying drawings, the construction, operation, and advantages of my invention will be readily understood without requiring further detailed description.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In an anger, substantially as described, the combination, with the bit having the square shoulders adjacent to its upper end,of thelaterally-reciprocating cutting-blade 6, the longitudinally-slotted cross-head mounted on the bit and engaging the shoulders thereof, the upwardly-extending lug carried by said cross-head, the cap-piece loosely mounted on the bit and having a rectangular groove engaging the lug of the cross-head, the lever pivotally connected at an intermediate point in its length to the bit and having its ends connected to the cross-head and the blade (3, respectively, a suitable means for rotating the bit, and asuitable means for holding the cap-piece stationary, substantially as specified.

2. In an anger, substantially as described, the combination, with the bit having the square shoulders adjacent to its upper end and the laterally-reciprocating cutting-blade 6, of the longitudinallyslotted cross head mounted on the bit and engaging the shoulders thereof, the upwardly-extending lug carried by said cross-head, the cap-pieceloosely mounted on the bit and having arectangular groove engaging the lug of the cross-head, suitable means for transmitting reciprocatory motion from the cross-head to the cuttingblade 6, a suitable means for rotating the bit, and a suitable means for holding the cappiece stationary, substantially as specified.

In testimony whereof I affix my signature in presence of two witnesses.

ANDREW LARS NEWTON.

\Vitnesses:

GARDINER GREENE, J r., PETER S. STEEFENSEN. 

